CDPHE Air Pollution Control Division

An Ozone Action Day Alert is in effect until Midnight Friday night.

High ozone will continue through Friday evening, but breezy weather on Saturday will limit ozone development.

For more details: https://www.colorado.gov/airquality/advisory.aspx

An Air Quality Health Advisory for Ozone is in effect for Mesa and Garfield Counties until 10 PM Thursday. For more details: https://www.colorado.gov/airquality/colo_advisory.aspx

Ozone was enhanced on Thursday by influence from the upper atmosphere, however high levels of ozone in the Front Range remain possible on Thursday and again on Friday. An Ozone Action Day alert has been issued until 4 pm on Friday. Reduce outdoor exertion if possible to avoid exposure and impacts. https://www.colorado.gov/airquality/advisory.aspx

Higher ozone is expected for parts of the Front Range today, due to a weather phenomenon known as a stratospheric intrusion.

An Air Quality Health Advisory is in effect for the Front Range today. For details, visit our website: https://www.colorado.gov/airquality/colo_advisory.aspx

Visit CDPHE's website for more information on stratospheric intrusions: https://cdphe.colorado.gov/ozone-pollution-and-your-health

An Air Quality Health Advisory for Ozone has been issued for Teller, El Paso, Pueblo, and eastern Fremont Counties. Take it easy outdoors in these areas on Saturday.
https://www.colorado.gov/airquality/colo_advisory.aspx

An Air Quality Health Advisory for Wildfire Smoke is in effect in southeast Colorado. Periods of moderate to heavy smoke are possible throughout the day.

For more information: https://www.colorado.gov/airquality/colo_advisory.aspx

An Ozone Action Day Alert is in effect until Midnight Friday night. Ozone may reach the Unhealthy for Sensitive Groups category in Denver, Greeley, and surrounding areas.

For more information: https://www.colorado.gov/airquality/advisory.aspx?county=weld

Ozone concentrations in the Unhealthy for Sensitive Groups category are possible on Monday and Tuesday in the northern Colorado Front Range, including the Denver Metro area, Fort Collins, Greeley, and the surrounding areas. Move activity indoors or reduce your level of exertion if possible on Monday and Tuesday afternoon. https://www.colorado.gov/airquality/advisory.aspx

It’s Air Quality Awareness Week.

Do you want to receive updates about air quality near you? Sign up for Air Quality Alert notifications!

Visit colorado.gov/airquality/request_alerts.aspx.
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Es la Semana de Concientización sobre la Calidad del Aire.

¿Deseas recibir novedades sobre la calidad del aire en tu zona? Inscríbete para recibir alertas sobre la calidad del aire.

Visita https://www.colorado.gov/airquality/request_alerts.aspx

¡Estamos celebrando la Semana de Concientización sobre la Calidad del Aire!

Los objetivos de esta iniciativa a nivel nacional son compartir información sobre la importancia del aire limpio, las medidas que se están abordando para combatir la contaminación del aire y los recursos disponibles para seguir colaborando.

https://cdphe.colorado.gov/press-release/air-quality-awareness-week-2026